|Hart, Stephen - UNIVERSITY OF ILLINOIS|
|Maxwell, Douglas - UNIVERSITY OF ILLINOIS|
Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: December 18, 1997
Publication Date: N/A
Technical Abstract: We designed this study to compare various burndown treatments for control of existing weeds prior to soybean planting. The study was established at the University of Illinois South Farm, Urbana. The soil was Flanagan silt loam with a pH of 6.4 and 4.8% organic matter. Pioneer 9394 soybeans were planted 1.0 inch deep on May 13 in 30 inch rows. Treatments were arranged in randomized complete blocks with three replications of plots 7.5 by 36 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles. Giant foxtail control with paraquat, ICIA0224, and glyphosate applied alone or with metribuzin averaged 62%. This was due to subsequent germinations of giant foxtail following herbicide applications. The addition of chlorimuron plus metribuzin or chlorimuron plus sulfentrazone improved giant foxtail control by providing soil residual. Control of common lambsquarters with paraquat, ICIA0224, or glyphosate applied alone increased as herbicide rate increased. However, top control was only about 80%. The addition of metribuzin, chlorimuron and metribuzin, chlorimuron and sulfentrazone or 2,4-D improved common lambsquarters control.